Validates: Colibri spawns agent process (fake-pi-agent.py) → reads
JSONL stdout → glasspane ingests → snapshot shows Done state with
correct session ID.
Uses scripts/fake-pi-agent.py which emits the colibri-pi-events
JSONL taxonomy (session, agent_start, turn_start, turn_end,
agent_end). Proves the spawn→ingest→glasspane pipeline without
requiring the real pi binary.
The real Pi binary path (when installed) follows the same pattern:
pi --mode json is spawned with identical spawner code.
Build: pass | Tests: 1/1 green | Workspace: all green
